package com.tc.dispatch.gsservice.basic.common;

public class URLCode {
  public static String unescape(String src) {
    StringBuffer tmp = new StringBuffer();
    tmp.ensureCapacity(src.length());
    int lastPos = 0, pos = 0;
    char ch;
    while (lastPos < src.length()) {
      pos = src.indexOf("%", lastPos);
      if (pos == lastPos) {
        if (src.charAt(pos + 1) == 'u') {
          ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
          tmp.append(ch);
          lastPos = pos + 6;
        }
        else {
          ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
          tmp.
              append(ch);
          lastPos = pos + 3;
        }
      }
      else {
        if (pos == -1) {
          tmp.append(src.substring(lastPos));
          lastPos = src.length();
        }
        else {
          tmp.append(src.substring(lastPos, pos));
          lastPos = pos;
        }
      }
    }
    return tmp.toString();
  }

  public static String escape(String src) {
    int i;
    char j;
    StringBuffer tmp = new StringBuffer();
    tmp.ensureCapacity(src.length() * 6);
    for (i = 0; i < src.length(); i++) {
      j = src.charAt(i);
      if (Character.isDigit(j) || Character.isLowerCase(j) ||
          Character.isUpperCase(j)) {
        tmp.append(j);
      }
      else if (j < 256) {
        tmp.append("%");
        if (j < 16) {
          tmp.append("0");
        }
        tmp.append(Integer.toString(j, 16));
      }
      else {
        tmp.append("%u");
        tmp.append(Integer.toString(j, 16));
      }
    }
    return tmp.toString();
  }

}